Electrochromic material is a novel smart material, and WO3 is the most studied electrochromic material currently.

MoO3 doped yellow tungsten oxide can be used to prepare an electrochromic film. Some experts use a square wave voltage with a period of 50s×2 to drive the doped tungsten trioxide film to have an electrochromic phenomenon. The coloring voltage was -1.7V, the bleaching voltage was +1.9V, and the transmission spectrum of the visible light and its adjacent region was measured with a spectrophotometer. They found that:

MoO3 doped tungsten trioxide thin film can be prepared by electron beam evaporation method. Among them, some experts used electron beam evaporation method to prepare tungsten trioxide electrochromic films with different MoO3 doping amount. They found that the obtained the electrochromic films of doped tungsten trioxide have better electrochromic properties.

MoO3 doped tungsten oxide electrochromic film can be prepared by an electron beam evaporation method in an ultra-high vacuum electron beam coating machine. Specifically, the steps are as follows:

Doped tungsten oxide can be used to prepare a thin film like tungsten oxide. So, what kind of film is prepared? A functional film, more specifically, an electrochromic film. It is mainly applied to the smart windows.

Hydrated tungsten oxide, like tungsten oxide, can be applied for the preparation of electrochromic film. Experts say that the crystal water in the hydrated WO3 crystal lattice can provide a faster transmission path for ion transport, so it tends to exhibit superior electrochromic properties. And therefore it has become the focus of current research.

WO3 can be applied to FTO conductive glass in the form of a film. Specifically, the hydrothermal precursor fluid must be configured first:

Tungsten trioxide can be applied to the FTO conductive glass in the form of a seed crystal liquid. Specifically, it is necessary to prepare a tungsten trioxide seed crystal liquid first:

Hydrated tungsten trioxide can be used to prepare electrochromic film and thus be applied to architectural glass. In recent years, this new type of smart heat insulation material is more and more widely applied to large-area glass. Therefore, experts are exploring ways to improve the electrochromic properties of tungsten trioxide nano powder.

Tungsten trioxide can be applied to car window in the form of electrochromic glasses, that is, smart windows. On these electrochromic glasses, tungsten trioxide nano powder acts as a cathode coloring material. In April 2014, the first National Electrochromic Conference was held, indicating that research in the field of electrochromism in China has begun to heat up. Among them, tungsten trioxide nano particles, the representative in the inorganic electrochromic material, has been commercialized.